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Corrosion behavior in Hank's solution of a magnesium-hydroxyapatite composite processed by high-pressure torsion

Corrosion behavior in Hank's solution of a magnesium-hydroxyapatite composite processed by high-pressure torsion
Corrosion behavior in Hank's solution of a magnesium-hydroxyapatite composite processed by high-pressure torsion
It is known that magnesium (Mg)-hydroxyapatite (HA) composites can be produced by the room temperature consolidation of particles. The present study analyzes the corrosion behavior of an Mg-HA composite and makes a direct comparison with pure Mg. Samples of Mg-HA and of pure Mg were immersed in Hank`s solution for up to 60 hours and the microstructure and corrosion products were characterized by scanning and transmission electron microscopy and X-ray diffraction. Electrochemical tests were used to evaluate the corrosion behavior and a hydrogen evolution test was undertaken to determine the corrosion rate. The results show the corrosion rate of the Mg-HA composite is higher than for pure Mg but decreases significantly after ~10 hours of immersion in Hank`s solution. The increase in corrosion resistance of the composite is attributed to the formation of a protective layer of corrosion products with an external surface layer rich in Ca, P and O.
High-pressure torsion, hydroxyapatite, Magnesium, Metal matrix composite, Corrosion
1438-1656
Lopes, D.
f0f09717-0d12-4578-ac99-3d597fa45d7c
Soares, Renata Braga
0f5576cd-94d5-417f-b959-0466f2a33d88
Castro, M.
7b028f0d-a633-4149-9522-1b3797bae8cf
Figueiredo, R.
43309231-e9a2-435b-b175-4200b139c945
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Lins, Vanessa F.C.
6cc9cd28-501a-495d-a452-5ed5366b0601
Lopes, D.
f0f09717-0d12-4578-ac99-3d597fa45d7c
Soares, Renata Braga
0f5576cd-94d5-417f-b959-0466f2a33d88
Castro, M.
7b028f0d-a633-4149-9522-1b3797bae8cf
Figueiredo, R.
43309231-e9a2-435b-b175-4200b139c945
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Lins, Vanessa F.C.
6cc9cd28-501a-495d-a452-5ed5366b0601

Lopes, D., Soares, Renata Braga, Castro, M., Figueiredo, R., Langdon, Terence G. and Lins, Vanessa F.C. (2020) Corrosion behavior in Hank's solution of a magnesium-hydroxyapatite composite processed by high-pressure torsion. Advanced Engineering Materials, 22 (12), [2000765]. (doi:10.1002/adem.202000765).

Record type: Article

Abstract

It is known that magnesium (Mg)-hydroxyapatite (HA) composites can be produced by the room temperature consolidation of particles. The present study analyzes the corrosion behavior of an Mg-HA composite and makes a direct comparison with pure Mg. Samples of Mg-HA and of pure Mg were immersed in Hank`s solution for up to 60 hours and the microstructure and corrosion products were characterized by scanning and transmission electron microscopy and X-ray diffraction. Electrochemical tests were used to evaluate the corrosion behavior and a hydrogen evolution test was undertaken to determine the corrosion rate. The results show the corrosion rate of the Mg-HA composite is higher than for pure Mg but decreases significantly after ~10 hours of immersion in Hank`s solution. The increase in corrosion resistance of the composite is attributed to the formation of a protective layer of corrosion products with an external surface layer rich in Ca, P and O.

Text
RBF-Lopes-adem.202000765_R1 - Accepted Manuscript
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More information

Accepted/In Press date: 22 July 2020
e-pub ahead of print date: 30 July 2020
Published date: 9 August 2020
Keywords: High-pressure torsion, hydroxyapatite, Magnesium, Metal matrix composite, Corrosion

Identifiers

Local EPrints ID: 442750
URI: http://eprints.soton.ac.uk/id/eprint/442750
ISSN: 1438-1656
PURE UUID: ddbc2cbb-988a-48af-a073-a9f01c86824b
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 24 Jul 2020 16:45
Last modified: 22 Nov 2021 08:12

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Contributors

Author: D. Lopes
Author: Renata Braga Soares
Author: M. Castro
Author: R. Figueiredo
Author: Vanessa F.C. Lins

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